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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5a7495a109ab2d673532f2ee8d38aad5f9f2a25b1302717e8d89ad8e5031f3' 
  AND token = 'htiQw+3/udoa1JzVNGWUO1SPBJRDkNEvGPxInFnO5os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}